Function kassert_panic

freebsd/kern/kern_shutdown.c:768–828

* Called by KASSERT, this decides if we will panic * or if we will log via printf and/or ktr. */

 * or if we will log via printf and/or ktr.
 */
void
kassert_panic(const char *fmt, ...)
{
	static char buf[256];
	va_list ap;

	va_start(ap, fmt);
	(void)vsnprintf(buf, sizeof(buf), fmt, ap);
	va_end(ap);

	/*
	 * If we are suppressing secondary panics, log the warning but do not
	 * re-enter panic/kdb.
	 */
	if (panicstr != NULL && kassert_suppress_in_panic) {
		if (kassert_do_log) {
			printf("KASSERT failed: %s\n", buf);
#ifdef KDB
			if (trace_all_panics && trace_on_panic)
				kdb_backtrace();
#endif
		}
		return;
	}

	/*
	 * panic if we're not just warning, or if we've exceeded
	 * kassert_log_panic_at warnings.
	 */
	if (!kassert_warn_only ||
	    (kassert_log_panic_at > 0 &&
	     kassert_warnings >= kassert_log_panic_at)) {
		va_start(ap, fmt);
		vpanic(fmt, ap);
		/* NORETURN */
	}
#ifdef KTR
	if (kassert_do_ktr)
		CTR0(ktr_mask, buf);
#endif /* KTR */
	/*
	 * log if we've not yet met the mute limit.
	 */
	if (kassert_do_log &&
	    (kassert_log_mute_at == 0 ||
	     kassert_warnings < kassert_log_mute_at)) {
		static  struct timeval lasterr;
		static  int curerr;

		if (ppsratecheck(&lasterr, &curerr, kassert_log_pps_limit)) {
			printf("KASSERT failed: %s\n", buf);
			kdb_backtrace();
		}
	}
#ifdef KDB
	if (kassert_do_kdb) {
		kdb_enter(KDB_WHY_KASSERT, buf);
	}